/* ============================================================
   style.css — Solar System Simulation UI
   Legends Tech Studio | Glassmorphic Design System
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ────────────────────────────────────
   DESIGN TOKENS
──────────────────────────────────── */
:root {
  --glass-bg: rgba(8, 12, 24, 0.72);
  --glass-bg-dark: rgba(4, 6, 14, 0.88);
  --glass-border: rgba(80, 140, 220, 0.20);
  --glass-border-bright: rgba(100, 180, 255, 0.38);
  --glass-blur: blur(18px);

  --accent-blue: #4a90d9;
  --accent-cyan: #00d4ff;
  --accent-gold: #ffc947;
  --accent-violet: #9b5de5;
  --accent-green: #2ecc71;
  --accent-red: #e74c3c;

  --text-primary: #e8f0ff;
  --text-secondary: rgba(180, 205, 255, 0.72);
  --text-muted: rgba(140, 165, 210, 0.50);
  --text-value: #c9e4ff;

  --panel-w: 268px;
  --panel-radius: 14px;
  --header-h: 48px;
  --status-h: 36px;

  --transition-fast: 0.15s ease;
  --transition-med: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.45s cubic-bezier(0.4, 0, 0.2, 1);

  --font-ui: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* ────────────────────────────────────
   RESET & BASE
──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%; height: 100%; overflow: hidden;
  background: #000;
  font-family: var(--font-ui);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ────────────────────────────────────
   CANVAS
──────────────────────────────────── */
#solar-canvas {
  position: fixed; inset: 0;
  width: 100% !important; height: 100% !important;
  display: block; cursor: default;
  touch-action: none;
}
#solar-canvas:active { cursor: grabbing; }

/* ────────────────────────────────────
   LOADING SCREEN
──────────────────────────────────── */
#loading-screen {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse at 50% 40%, #060d1e 0%, #010208 100%);
  transition: opacity 0.6s ease;
}

.loader-content {
  display: flex; flex-direction: column;
  align-items: center; gap: 22px;
}

.loader-ring {
  width: 72px; height: 72px; border-radius: 50%;
  border: 3px solid rgba(74, 144, 217, 0.12);
  border-top-color: var(--accent-cyan);
  border-right-color: var(--accent-blue);
  animation: spin 1.1s cubic-bezier(0.45, 0.05, 0.55, 0.95) infinite;
  box-shadow: 0 0 28px rgba(0, 212, 255, 0.28);
}
@keyframes spin { to { transform: rotate(360deg); } }

.loader-text {
  font-size: 12.5px; font-weight: 500;
  letter-spacing: 0.10em; text-transform: uppercase;
  color: var(--text-secondary); min-height: 20px;
}

.loader-progress {
  width: 240px; height: 3px;
  background: rgba(255,255,255,0.07); border-radius: 2px; overflow: hidden;
}
#progress-bar {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
  transition: width 0.3s ease; border-radius: 2px;
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.55);
}

/* ────────────────────────────────────
   HUD WRAPPER
──────────────────────────────────── */
#hud {
  position: fixed; inset: 0;
  pointer-events: none; z-index: 100;
  display: flex; flex-direction: column;
}

/* ────────────────────────────────────
   TOP HEADER
──────────────────────────────────── */
#hud-header {
  pointer-events: all;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px; height: var(--header-h);
  background: var(--glass-bg-dark);
  backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  user-select: none; flex-shrink: 0;
}

.hud-title {
  font-size: 13px; font-weight: 700;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--accent-cyan);
  text-shadow: 0 0 16px rgba(0, 212, 255, 0.55);
}

#fps-counter {
  font-family: var(--font-mono); font-size: 12px; font-weight: 500;
  color: var(--accent-green); letter-spacing: 0.04em;
  padding: 4px 12px;
  background: rgba(46, 204, 113, 0.07);
  border: 1px solid rgba(46, 204, 113, 0.22); border-radius: 6px;
}

/* ────────────────────────────────────
   PANELS ROW
──────────────────────────────────── */
#panels-row {
  flex: 1; position: relative; overflow: hidden; pointer-events: none;
}

/* ────────────────────────────────────
   GLASS PANEL BASE
──────────────────────────────────── */
.panel {
  pointer-events: all; position: absolute; top: 14px;
  width: var(--panel-w);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border); border-radius: var(--panel-radius);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.04);
  overflow: hidden;
  transition: border-color var(--transition-med), box-shadow var(--transition-med);
  max-height: calc(100vh - var(--header-h) - var(--status-h) - 32px);
  display: flex; flex-direction: column;
}
.panel:hover {
  border-color: var(--glass-border-bright);
  box-shadow: 0 8px 40px rgba(0,0,0,0.6), 0 0 0 1px rgba(74,144,217,0.1),
              inset 0 1px 0 rgba(255,255,255,0.06);
}

#left-panel  { left: 14px; }
#right-panel { right: 14px; }

#custom-panel {
  left: 14px; top: auto;
  bottom: calc(var(--status-h) + 14px);
  max-height: 62vh;
}

/* ────────────────────────────────────
   PANEL HEADER
──────────────────────────────────── */
.panel-header {
  display: flex; align-items: center; gap: 8px;
  padding: 11px 14px;
  background: rgba(255,255,255,0.025);
  border-bottom: 1px solid var(--glass-border);
  font-size: 10.5px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-secondary); flex-shrink: 0;
}
.panel-icon { font-size: 13px; opacity: 0.7; }
.panel-header > span:nth-child(2) { flex: 1; }

.panel-collapse {
  background: none; border: none;
  color: var(--text-muted); font-size: 16px; line-height: 1;
  cursor: pointer; padding: 1px 5px; border-radius: 4px;
  transition: color var(--transition-fast), background var(--transition-fast);
}
.panel-collapse:hover { color: var(--text-primary); background: rgba(255,255,255,0.06); }

/* ────────────────────────────────────
   PANEL BODY
──────────────────────────────────── */
.panel-body {
  padding: 14px; display: flex; flex-direction: column; gap: 14px;
  overflow-y: auto; overflow-x: hidden; flex: 1;
  scrollbar-width: thin; scrollbar-color: rgba(74,144,217,0.3) transparent;
}
.panel-body::-webkit-scrollbar { width: 4px; }
.panel-body::-webkit-scrollbar-track { background: transparent; }
.panel-body::-webkit-scrollbar-thumb { background: rgba(74,144,217,0.3); border-radius: 2px; }

/* ────────────────────────────────────
   CONTROL GROUPS
──────────────────────────────────── */
.control-group { display: flex; flex-direction: column; gap: 7px; }

.control-label {
  font-size: 10px; font-weight: 600;
  letter-spacing: 0.10em; text-transform: uppercase;
  color: var(--text-secondary); user-select: none;
}

/* SELECT */
.control-select {
  appearance: none; -webkit-appearance: none;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--glass-border); border-radius: 8px;
  color: var(--text-primary); font-family: var(--font-ui);
  font-size: 12px; font-weight: 500;
  padding: 8px 32px 8px 12px; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%234a90d9' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}
.control-select:hover { border-color: var(--glass-border-bright); background-color: rgba(74,144,217,0.07); }
.control-select:focus { outline: none; border-color: var(--accent-blue); box-shadow: 0 0 0 2px rgba(74,144,217,0.2); }
.control-select option { background: #0a1225; color: var(--text-primary); }

/* SLIDER */
.control-slider {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 4px; border-radius: 2px;
  background: rgba(255,255,255,0.09); outline: none; cursor: pointer;
}
.control-slider::-webkit-slider-thumb {
  -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  cursor: pointer; border: 2px solid rgba(255,255,255,0.15);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.42);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.control-slider::-webkit-slider-thumb:hover { transform: scale(1.25); box-shadow: 0 0 16px rgba(0,212,255,0.65); }
.control-slider::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  border: 2px solid rgba(255,255,255,0.15); cursor: pointer;
}

/* ────────────────────────────────────
   TOGGLE SWITCHES
──────────────────────────────────── */
.toggles, .custom-toggles { display: flex; flex-direction: column; gap: 10px; }

.toggle-label {
  display: flex; align-items: center; gap: 10px;
  cursor: pointer; user-select: none;
  font-size: 12px; font-weight: 400; color: var(--text-primary);
  transition: color var(--transition-fast);
}
.toggle-label:hover { color: var(--accent-cyan); }
.toggle-label input[type="checkbox"] { position: absolute; opacity: 0; width: 0; height: 0; }

.toggle-track {
  position: relative; width: 36px; height: 20px;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--glass-border); border-radius: 10px; flex-shrink: 0;
  transition: background var(--transition-med), border-color var(--transition-med);
}
.toggle-thumb {
  position: absolute; left: 2px; top: 2px;
  width: 14px; height: 14px; background: var(--text-muted); border-radius: 50%;
  transition: transform var(--transition-med), background var(--transition-med);
}
.toggle-label input:checked + .toggle-track {
  background: rgba(0,212,255,0.18); border-color: var(--accent-cyan);
}
.toggle-label input:checked + .toggle-track .toggle-thumb {
  transform: translateX(16px); background: var(--accent-cyan);
  box-shadow: 0 0 9px rgba(0,212,255,0.6);
}

/* ────────────────────────────────────
   INFO PANEL
──────────────────────────────────── */
#info-body-name {
  flex: 1; font-size: 11px; letter-spacing: 0.15em;
  color: var(--accent-gold); font-weight: 700;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.info-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 5px 0; border-bottom: 1px solid rgba(255,255,255,0.03);
}
.info-label {
  font-size: 10px; font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-muted);
}
.info-value {
  font-family: var(--font-mono); font-size: 11px;
  font-weight: 500; color: var(--text-value);
}
.info-separator { height: 1px; background: var(--glass-border); margin: 4px 0; }
.info-hint {
  font-size: 11px; color: var(--text-muted);
  text-align: center; padding: 8px 0 4px; font-style: italic;
}

/* ────────────────────────────────────
   APPLY BUTTON
──────────────────────────────────── */
.btn-apply {
  width: 100%; padding: 10px;
  background: linear-gradient(135deg, rgba(74,144,217,0.22), rgba(0,212,255,0.13));
  border: 1px solid rgba(74,144,217,0.38); border-radius: 8px;
  color: var(--accent-cyan); font-family: var(--font-ui);
  font-size: 11px; font-weight: 700; letter-spacing: 0.10em; text-transform: uppercase;
  cursor: pointer; transition: all var(--transition-med); margin-top: 4px;
}
.btn-apply:hover {
  background: linear-gradient(135deg, rgba(74,144,217,0.38), rgba(0,212,255,0.22));
  border-color: var(--accent-cyan); box-shadow: 0 0 20px rgba(0,212,255,0.22);
  transform: translateY(-1px);
}
.btn-apply:active { transform: translateY(0); }

/* ────────────────────────────────────
   STATUS BAR
──────────────────────────────────── */
#status-bar {
  pointer-events: all; height: var(--status-h);
  display: flex; align-items: center;
  background: var(--glass-bg-dark);
  backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
  border-top: 1px solid var(--glass-border); padding: 0 18px; flex-shrink: 0;
}
#status-bar > span {
  font-family: var(--font-mono); font-size: 10.5px; font-weight: 500;
  letter-spacing: 0.05em; padding: 0 14px;
  border-right: 1px solid var(--glass-border); color: var(--text-secondary);
}
#status-bar > span:last-child { border-right: none; }
#status-fps   { color: var(--accent-green); }
#status-quality { color: var(--accent-gold); text-transform: uppercase; }
#status-bodies { color: var(--accent-blue); }
#status-gpu   { color: var(--text-muted); }

/* ────────────────────────────────────
   BODY LABELS
──────────────────────────────────── */
#labels-container { position: fixed; inset: 0; pointer-events: none; z-index: 50; }

.body-label {
  position: absolute; pointer-events: auto; white-space: nowrap; display: none;
  font-family: var(--font-ui); font-size: 10px; font-weight: 600;
  letter-spacing: 0.10em; text-transform: uppercase;
  color: rgba(190, 215, 255, 0.82);
  text-shadow: 0 0 8px rgba(0,0,0,0.9), 0 1px 3px rgba(0,0,0,0.8);
  padding: 2px 7px;
  background: rgba(0,10,30,0.70); border-radius: 4px;
  border-left: 2px solid rgba(74,144,217,0.7);
  transform: translateY(-50%);
  cursor: pointer;
  user-select: none;
  transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}
.body-label:hover {
  background: rgba(0, 30, 80, 0.90);
  border-left-color: var(--accent-cyan);
  color: #ffffff;
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
}

/* ────────────────────────────────────
   SCROLLBAR
──────────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(74,144,217,0.28); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(74,144,217,0.48); }

/* ────────────────────────────────────
   RESPONSIVE
──────────────────────────────────── */
@media (max-width: 900px) { :root { --panel-w: 220px; } }
@media (max-width: 640px) {
  #left-panel, #custom-panel { display: none; }
  #right-panel { left: 10px; right: 10px; width: auto; }
}